CHEMISTRY COMMUNITY

Jordan_Wesson_2J

How does mass left = mass initial * e^-kt when the reaction takes place in a sealed vessel? ( referencing 7th edition 7B.15 part c)

Jordan_Wesson_2J

I am not sure what this means either and I also don’t understand how they got 1.8 for k’/k even when you subtract 0.59.

Jordan_Wesson_2J

Are there two different meanings for k’ and capital A in kinetics?

Jordan_Wesson_2J

Why do we round reaction orders when they are not exactly whole numbers?

Jordan_Wesson_2J

The book and solutions manual use the variable "a" when referring to reaction order but it also uses it when referring to the stoichiometric coefficient of in the unique average rate equation. Is there any relation between these "a"s?

Jordan_Wesson_2J

Why do negative k values not exist?

Jordan_Wesson_2J

If you get confused thinking about all these OH- molecules and H2O molecules just think of it the exact same way you work with acidic solutions, only this time you want to neutralize the H+ you added so turn them into water by adding the same amount of OH- on both sides.

Jordan_Wesson_2J

Which equation is the most accurate for finding DeltaG and why?

Jordan_Wesson_2J

Why is the mol included in the units if the equation for DeltaG=-nFEcell?
Shouldn’t the moles cancel out?

Jordan_Wesson_2J

Usually Boltzmann’s constant will be indicated with a lower case k whereas the gas constant will be indicated with a uppercase R.

Jordan_Wesson_2J

How is the maximum work and delta G equal?

Jordan_Wesson_2J

Why does a positive Cell potential indicate a spontaneous reduction?

Jordan_Wesson_2J

The book makes it seem like a galvanic cell is a type of electrochemical cell but not vice versa. Is this correct?

Jordan_Wesson_2J

Is there some way to determine if a molecule is in its most stable form with out it being given?

Jordan_Wesson_2J

If you were given the specific heat capacity of an ideal gas at constant pressure or volume would that be the same as calculate 5/2*R or 3/2*R, respectively? If so which is more accurate?

Jordan_Wesson_2J

3.00 L of nitrogen gas at 18.5 C compress suddenly to 0.500 L. Process increased temperature of the gas to 28.1 C.

How do we know to just use one mole in the change in entropy equation?

Jordan_Wesson_2J

How do we use the change in entropy equation if there is a change in pressure only?

Jordan_Wesson_2J

Why does the book use the the two gas constants (8.314 J/K/mol divided by 0.0826 L*atm/K/mol) instead of the direct unit conversion? And which should we use on the test?

Jordan_Wesson_2J

This question is calculating the final heat of a glass of water after a cube of ice is added with no heat lost to the surroundings. Once we find the heat required to take the ice cube from solid to liquid plus the heat required to raise its temperature, then find the heat of the water the cube was d...

Jordan_Wesson_2J

How does Cp become 5/2 R in part a of 4C.3 7th edition?

Jordan_Wesson_2J

How do we go from Atmospheres to Joules? Is this a direct unit conversion, and if so, do we need to memorize the value?

Jordan_Wesson_2J

Why don't we consider solids and liquids when pressure is being changed?

Jordan_Wesson_2J

Where does Al(H2O)6 come from in the solutions manual? The initial molecule is AlCl3.

Jordan_Wesson_2J

Why must we subtract the calculated concentrations of H+ and OH- from the initial concentration when plugging it into the Kc equation?

Jordan_Wesson_2J

Where do you get the concentration of O2 in this question?

Jordan_Wesson_2J

When does [H30+] = [OH-]?

Jordan_Wesson_2J

What is the significance of the 1 after pKa in the solution manual like in question 6C.3 7th addition?

Jordan_Wesson_2J

What does the small circle that looks like a degree symbol over some variable in the equations indicate?

Jordan_Wesson_2J

How are flask 3 and 4 different? Both flasks have 6/11 decomposed X2 molecules.

Jordan_Wesson_2J

Using the ATP +H2O <> ADP + Pi reaction example from class, if there were to have been initial values for ADP and Pi would you add them together and then add that value to the change in molarity?

Jordan_Wesson_2J

how would you know that zinc has a plus two charge if just given the name "zinc nitrite"?

Jordan_Wesson_2J

why don't these acids and base create water? I thought they always needed to generate a water molecule.
This is part b of Fundamentals J.9

Jordan_Wesson_2J

why is having a pH outside of the 1-14 range rare?

Jordan_Wesson_2J

Can someone explain how resonance effects acidity?

Jordan_Wesson_2J

How do you know when adding a salt can cause it to become more acidic? why doesn't NaCl do this?

Jordan_Wesson_2J

Can someone explain again why we can’t use hybridization to find shape?

Jordan_Wesson_2J

Is there any reason why the two lone pair electrons stay next to each other, making the molecule bent, besides the fact that it has 4 regions of electron density? Like why wouldn't they want to be opposite sides from each other and make the molecule linear?

Jordan_Wesson_2J

Is it necessary to indicate the shell of the hybrid orbital? sp3, 2sp3...

Jordan_Wesson_2J

In lecture, the slides had this list:
ion-ion -250kJ.mol^-1
ion-dipole -15 kJ.mol^-1
dipole-dipole -2kJ.mol^-1

I was just wondering if anyone could tell me what these values were of again?

Jordan_Wesson_2J

Do T-shaped molecules with VSEPR formula AX3E2 and AX3E3 have the same angles? and if so why?

Jordan_Wesson_2J

Why are molecules with this VSEPR formula linear when there are 3 lone pairs?

Jordan_Wesson_2J

Why can an expanded octet have 10,12... electrons when octets always need exactly 8?

Jordan_Wesson_2J

I was taught that in general Van Der Waals and usually weaker than hydrogen bonds but at some point can become stronger if the size of the molecules is big enough. I was wondering if this was correct, and if so, how would you find out when it becomes stronger?

Jordan_Wesson_2J

In my discussion, my TA said that there were dipole-dipole, Van Der Waal, and hydrogen bonds present between two water molecules and I was wondering where each of these would be between the two molecules.

Jordan_Wesson_2J

What does it mean to say that an electron is added to a gas-phase atom? I guess a better question might be what is a gas-phase atom?

Jordan_Wesson_2J

The solutions guide said that Ag+ had an electron configuration of 4d10. Do all group 11 ions follow this rule?

Jordan_Wesson_2J

Why is the electron configuration for Ag+ 4d10 instead of 4d9 5s1?

Jordan_Wesson_2J

During lecture Dr. Lavelle said that the x,y, and z labels for px,py, and pz were arbitrary but are they arbitrary for d orbital as well?

Jordan_Wesson_2J

What is the difference in degeneracy for an H-atom and multielectron atoms? Do the same rules apply?

Jordan_Wesson_2J

Is Heisenberg’s indeterminacy equation just to calculate the +/- value and is the value you calculate for deltaX, for example, the +/- value or do you need to divide it by two?

Jordan_Wesson_2J

So in lecture and on homework, we talked about calculating the wavelength of a baseball and I wasn't sure what was meant by this. Can anyone help clarify how a ball has a wavelength?

Jordan_Wesson_2J

In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.

Which equation would you use to figure this out?

Jordan_Wesson_2J

Why does the solutions guide have the uncertainty equation as (delta)p(delta)x = (1/2)h but Lavelle taught it as (delta)p(delta)x >/= (1/4pi)h?

Jordan_Wesson_2J

In lecture today, Dr. Lavelle said the reason you change the sign for the change in energy to a positive when you plug it into the E=hv and I forgot what he said. Can someone please help explain?

Jordan_Wesson_2J

What is the difference between the work function and the workforce? Are they the same?

Jordan_Wesson_2J

In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line. I'm not sure where to begin with this question and what it is referring to...

Jordan_Wesson_2J

Balance equation: Fe3O4 + CO --> Fe + CO2 I understand how to balance this equation by thinking about it but I wanted to see if anyone knew any tricks for balancing oxygen in this without jumping back and forth from reaction to the product to see if it balanced. I liked the trick Dr. Lavelle taught ...

Jordan_Wesson_2J

To prepare a fertilizer solution, a florist dilutes 1.0 L of 0.20M NH4NO3 (aq) by adding 3.0 L of water. The nurse then adds 100. mL of the diluted solution to each plant. How many moles of nitrogen atoms will each plant receive?

Jordan_Wesson_2J

So we know from the molecular formula that we have 4 moles of H20. This means that we have to multiply 4 by the number of moles calculated in part A which was 0.42 moles. Doing this we get 0.168 moles of H2O but the question is asking how many molecules are present so we have to convert by multiplyi...

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